Malicious PDF — malware analysis report

Static analysis result for SHA-256 2226f94543878205…

MALICIOUS

PDF

85.6 KB Created: 2021-05-09 16:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1226eb671abdf17178428bbc83a80b6e SHA-1: 13c66f78d6e8622991c0ba6befc553334c8b9253 SHA-256: 2226f94543878205debe91e7853e89ed3686f0f4404bd1fcd8bfae0010dfe152
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, with one heuristic specifically identifying a 'mass external PDF link farm'. The ClamAV detection and ML classifier strongly indicate maliciousness, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/strik?utm_term=chinese+aid+to+africa+pdf
    • https://cdn.sqhk.co/vaminika/Khgjejf/live_earth_map_2020_gps_satellite_street_view.pdf
    • https://cdn.sqhk.co/zanotunuzi/ccheiiS/69378246262.pdf
    • https://cdn.sqhk.co/mojikeke/ZMLylhc/heroes_tonight_piano_sheet_music.pdf
    • https://cdn.sqhk.co/kojanakif/GJjd6if/formal_letter_of_resignation_template.pdf
    • https://cdn.sqhk.co/mupalewefe/giihiid/battle_strike_force_movie_download.pdf
    • http://manidat.sportsontheweb.net/43769469501.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/paropabaru/gvp_guideline_module_1.pdf
    • https://uploads.strikinglycdn.com/files/4c0d0672-529d-43bc-b516-feb2f63c5f66/william_shakespeare_sonnet_18_summary.pdf
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_3f202829f564419e83cfd7cc8d9a3c01.pdf?index=true
    • https://s3.amazonaws.com/tosevud/safik.pdf
    • https://49884795-3b66-401c-adaf-b59e999553af.filesusr.com/ugd/8bd6c9_f6ed7aa497ac42d4bb25b406fd8c8621.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b0cfa266-6462-4f3d-b826-ddb84855746d/28731121336.pdf
    • https://uploads.strikinglycdn.com/files/38f47c9e-5c6d-4ce9-83a7-3082586fca53/how_to_update_firmware_lg_soundbar.pdf
    • https://50b44c92-959e-4a15-bf83-93d6b2b518d6.filesusr.com/ugd/3ed44c_a94c76a7c624414b8beb6b5266c40e02.pdf?index=true
    • https://uploads.strikinglycdn.com/files/d42ccc86-ac9c-4e1f-9536-e754f2ccb63c/beginners_running_programme.pdf
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_3efacbd2e8174e3f89affdb39c25b0fd.pdf?index=true
    • https://033a7475-7ccb-45c1-8f1e-38fd320d48d0.filesusr.com/ugd/03a576_a35a1f69743c499d9d675adfe4bf645f.pdf?index=true
    • http://lugivodunoxasi.atwebpages.com/tofokejedijedu.pdf
    • https://uploads.strikinglycdn.com/files/f9724245-4546-42ae-b3a3-c9e1592c3873/how_to_adjust_time_on_g-shock_digital.pdf
    • https://uploads.strikinglycdn.com/files/097772b0-cc78-4478-9594-08b1b2edf080/puvoguwinusal.pdf
    • https://s3.amazonaws.com/winumigutam/89238880753.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001040a.bin
0c318c3ae00da1e20cdd8e7599e91ae20143b3426fbdab175975a7549bf94984		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040A 5024 bytes
font_01_sfnt_off0001150b.bin
e592ee6291ef5a9d988bbaef8aac5fe3fae830b0e0372fb76a2b9268a60a3188		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1150B 11344 bytes
font_02_sfnt_off00013b26.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13B26 4324 bytes

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